George b



G'. B. ESSEX. BOILER ALARM.

(No Model.)

Patented May 2, 1,893.

M T m V m ylmsss UNITED STATES PATENT OFFICE.

GEORGE B. ESSEX, OF DETROIT, MICHIGAN, ASSIGNOR `TC THE MICHIGAN LUBRICATCR COMPANY, OF SAME PLACE.

BOILER'ALARIVI.

SPECIFICATION forming part of Letters Patent No. 496,557, dated May 2, 1893.

Application tiled April 15, 1892. Serial No. 429,377. (No model.)

To a/ZZ whom it may concern,.-

Be it known that I, GEORGE B. ESSEX, a citizen of the United States, residing at Detroit, county of Vayne, State of Michigan, have invented a certain new and useful-Improvement in Alarm-Whistles for Boilers; and I declare the'following to be a full, clear, and exact description of the invention, such as will enable others skilled in rthe art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Figure l is a perspective ot' my alarm whistle for boilers. Fig. 2 is a sectional view ot the same. the line x ot' Fig. 2. Fig. 4 is a horizontal section on the line y y of Fig. 2.

My invention relates to alarm whistles for steam boilers, and its object is to provide a whistle that will sound an alarm when the water in the boiler goes either above or below a certain predetermined limit.

Another object is to provide for readily adjusting the device.

These objects I accomplish by a construction shown in the drawings, in which A is the base portion of the shell or case of the whistle. This partA is provided with the threaded portion, a, by which it is attached to the boiler. Below the threaded portion are the extensions, a', a', each provided with the slot a2, to acY cominodate the lever of the float, as hereinafter described.

` Screwed into the part Aof the case at a3, is the inner case or shell, B. This is provided with an annular flange b, which nearly fills the mouth of the cup portion, a4, of the case' A, leaving an annular opening b.

The case B is threaded for a distance from the upper end, to which is screwed the whistle proper, C. This whistle C extends down nearly to the case A, and presents its lower edge c to the annular opening b.

Mounted in the inner case is a plunger D,Y

having the enlarged portion d, forming a steam joint at d with the case A. This plunger is made triangular for a distance above the lower end, leaving steam passages d2 leading'up to the horizontal steam passage b2 in the case B. I also form the enlarged portion cl triangular, as shown in Fig. 4.

Fig. 3 is a horizontal section on The case B has an enlarged cavity at bin which is located the spring E. This spring acts against the nut F screwed on the top of the plunger, and by its action holds the plunger to the upper extremity of its movement, and forces the enlarged portion CZ to its seat in the casel A. y

The plunger D With this threaded portion is engaged the bolt H, to the lower end ot which is pivoted is internally threaded at d3.' Y

the lever K. This leverv has a portion c extending beyond the pivot, so that the lever has portions on each side ot its pivot, passing through the slots o?.l On the outer end of the lever K is the ioat K.

The plunger D is rotatable within its case, and is provided with a slot in its upper end, not shown, by which it may be turned by a screw driver, or by inserting a nail or other tool. I provide the cap M to cover the upper end of the plunger, which cap I screw to the case B above the whistle C.

The operation of my device is as follows: The device is screwed into the boiler, the extensions a', ot', depending into it. The lever is then pivoted to the bolt H, the float K resting in and on the water, and following the rise and fall of the water. The cap M is then removed and the plunger rotated with a screw or other tool. As the plunger rotates, the bolt H is forced up or down and the pivot end of the lever adjusted vertically at will. When the device is placed in the boiler and its working parts are in their normal position, the enlarged portion cl of the plunger closes the steam passages through the whistle; but when the water rises in the boiler a sufcient distance, the I'loat will carry the lever upward sages d2 to the passage 0,3, and out through the annular opening b, where it will sound the whistle. In like manner, if the water goes below a certain limit in the boiler, the lever will drop and the extension 7c will strike against the case A at the upper end ot` its slot, and draw down the plunger and sound the Whistle. The device may be adjusted to allow a greater or less variation between the upper and lower Water limits, by adjusting the pivot of the lever vertically. This is done by screwing the cap M, and rotating the plunger. This plungerhaving a screw connection with the bolt H, moves this bolt vertically and secures the adjustment.

I am not aware that this class of alarm Whistles has ever been used, in which an adjustment has been provided outside of the boiler, and one that can be adjusted without opening the boiler.

1. In an alarm whistle for boilers, the combination of a case, a plunger located in said case and adapted to operate the valve, a oat lever pivoted to the valve, said case provided on either side ot said plunger with a projection adapted to operate as a fnlcrum for said float lever, whereby the valve is opened Whenever the float goes above or below a certain limit substantially as described.

2. In an alarm whistle for boilers, the combination of the case A, the inner case B, the plunger D, and the ioat lever K, pivoted to said plunger and adapted to fulcrnm on the case at either side of said plunger, substantially as andfor the purposes described.

In testimony whereof I sign this specification in the presence of two witnesses.

GEORGE B. ESSEX. lVitnesses:

MARION A. REEVE, C. Il. FIsK. 

